Off-balance Sheet Lending-related Financial Instruments, Guarantees, and Other Commitments (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	$ 1,383,325	$ 1,326,782
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	995,303
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	144,162
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	213,509
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	30,351
Off-balance sheet lending-related financial commitments, Carrying value	2,788	2,817
Total Consumer
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	898,786	854,802
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	880,765
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	3,864
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,498
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	7,659
Off-balance sheet lending-related financial commitments, Carrying value	70	75
Total consumer, excluding credit card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	37,568	33,518
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	19,547
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	3,864
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,498
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	7,659
Off-balance sheet lending-related financial commitments, Carrying value	70	75
Residential real estate
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	23,343	21,287
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	7,237
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	3,863
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	6,498
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	5,745
Off-balance sheet lending-related financial commitments, Carrying value	70	75
Auto and other
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	14,225	12,231
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	12,310
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	1
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	0
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	1,914
Off-balance sheet lending-related financial commitments, Carrying value	0	0
Credit card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	861,218	821,284
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	861,218
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	0
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	0
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	0
Off-balance sheet lending-related financial commitments, Carrying value	0	0
Total wholesale
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	484,539	471,980
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	114,538
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	140,298
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	207,011
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	22,692
Off-balance sheet lending-related financial commitments, Carrying value	2,718	2,742
Other unfunded commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	453,824	440,407
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	97,803
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	131,725
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	202,649
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	21,647
Off-balance sheet lending-related financial commitments, Carrying value	2,282	2,328
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information
Risk participations for other unfunded commitments to extend credit	64	71
Standby letters of credit and other financial guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	26,755	27,439
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	13,172
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	8,279
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	4,259
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	1,045
Off-balance sheet lending-related financial commitments, Carrying value	427	408
Other guarantees and commitments, Carrying value	337	326
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information
Risk participations for standby letters of credit and other financial guarantees	8,200	8,200
Other letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total lending-related commitments	3,960	4,134
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring in 1 year or less	3,563
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 1 year through 3 years	294
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 3 years through 5 years	103
Off-balance sheet lending-related financial commitments, Contractual amount, Expiring after 5 years	0
Off-balance sheet lending-related financial commitments, Carrying value	9	6
Other guarantees and commitments, Carrying value	0	0
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information
Risk participations for other letters of credit	350	512
Securities lending indemnification agreements and guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	325,217	283,386
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	325,217
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	0
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	0
Other guarantees and commitments, Contractual amount, Expiring after 5 years	0
Other guarantees and commitments, Carrying value	0	0
Off balance sheet lending related financial instruments guarantees and other commitments - supplemental information
Indemnification agreement securities lending guarantees collateral held in support of	340,900	298,500
Derivatives qualifying as guarantees
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	56,644	59,180
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	3,189
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	246
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	12,302
Other guarantees and commitments, Contractual amount, Expiring after 5 years	40,907
Other guarantees and commitments, Carrying value	286	649
Unsettled resale and securities borrowed agreements
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	137,722	116,975
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	137,021
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	701
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	0
Other guarantees and commitments, Contractual amount, Expiring after 5 years	0
Other guarantees and commitments, Carrying value	(1)	(2)
Unsettled repurchase and securities loaned agreements
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	99,485	66,407
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	98,941
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	544
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	0
Other guarantees and commitments, Contractual amount, Expiring after 5 years	0
Other guarantees and commitments, Carrying value	(2)	(7)
Mortgage repurchase liability
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan sale and securitization-related indemnifications, Mortgage repurchase liability, Carrying value	76	76
Loans sold with recourse
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Loan sale and securitization-related indemnifications, Loans sold with recourse, Contractual amount	816	820
Loan sale and securitization-related indemnifications, Loans sold with recourse, Carrying value	29	28
Exchange & clearing house guarantees and commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	174,476	191,068
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	174,476
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	0
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	0
Other guarantees and commitments, Contractual amount, Expiring after 5 years	0
Other guarantees and commitments, Carrying value	0	0
Other guarantees and commitments
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Other guarantees and commitments, Contractual amount	10,908	8,634
Other guarantees and commitments, Contractual amount, Expiring in 1 year or less	7,118
Other guarantees and commitments, Contractual amount, Expiring after 1 year through 3 years	735
Other guarantees and commitments, Contractual amount, Expiring after 3 years through 5 years	159
Other guarantees and commitments, Contractual amount, Expiring after 5 years	2,896
Other guarantees and commitments, Carrying value	$ 51	$ 53
Days Past Due, 60 or More | Credit card
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Line of credit close criteria, period past due	60 days